Add execution environment for Java SE 21 in Tycho plugin configuration

Author: ipa-rwu

plugins/de.fraunhofer.ipa.ros.parent/pom.xml

@@ -155,6 +155,7 @@
                 <artifactId>target-platform-configuration</artifactId>
                 <version>${tycho-version}</version>
                 <configuration>
+                    <executionEnvironment>JavaSE-21</executionEnvironment>
                     <environments>
                         <environment>
                             <os>macosx</os>
@@ -196,4 +197,4 @@
             </plugin>
         </plugins>
     </build>
-</project>
+</project>